// mixin: 混入(函数) 清除浏览器自带样式
clearDefault()
  appearance: none
  border: none
  outline: none

btn(c,border=false)
  padding 5px 10px
  border: 2px solid c
  // text-decoration: none
  border-radius: 5px
  color #FFFAF0
  cursor: pointer
  if (border==false)
    background-color: c
    color #FFFAF0
  else
    color #000

primaryBtn()
  bun(rgb(200, 200, 169))